diff --git a/tests/ut/worker/test_block_table.py b/tests/ut/worker/test_block_table.py
new file mode 100644
index 00000000000..ba378e9b1da
--- /dev/null
+++ b/tests/ut/worker/test_block_table.py
@@ -0,0 +1,258 @@
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+import unittest
+from unittest.mock import MagicMock, patch
+
+import numpy as np
+import torch
+from vllm.distributed.parallel_state import GroupCoordinator
+
+from tests.ut.base import TestBase
+
+
+class TestBlockTableComputeSlotMapping(TestBase):
+    """Test suite for BlockTable.compute_slot_mapping() method
+    
+    This test suite covers different configurations of DCP (Decode Context Parallelism),
+    PCP (Prefill Context Parallelism), and cp_kv_cache_interleave_size to ensure
+    correct slot_mapping calculation on different ranks.
+    """
+
+    def setUp(self):
+        """Set up common test fixtures"""
+        self.block_size = 128
+        self.max_num_reqs = 4
+        self.max_num_blocks_per_req = 128
+        self.max_num_batched_tokens = 512
+        self.pin_memory = False
+        self.device = torch.device("cpu")
+        self.kernel_sizes = [128]
+
+    def create_block_table(self, dcp_world_size, dcp_rank, pcp_world_size,
+                           pcp_rank, cp_kv_cache_interleave_size):
+        """Helper method to create BlockTable with mocked distributed groups"""
+
+        with patch('vllm_ascend.worker.block_table.get_dcp_group') as mock_get_dcp_group, \
+             patch('vllm_ascend.worker.block_table.get_pcp_group') as mock_get_pcp_group:
+
+            # Mock DCP group
+            mock_dcp_group = MagicMock(spec=GroupCoordinator)
+            mock_dcp_group.world_size = dcp_world_size
+            mock_dcp_group.rank_in_group = dcp_rank
+            mock_get_dcp_group.return_value = mock_dcp_group
+
+            # Mock PCP group
+            mock_pcp_group = MagicMock(spec=GroupCoordinator)
+            mock_pcp_group.world_size = pcp_world_size
+            mock_pcp_group.rank_in_group = pcp_rank
+            mock_get_pcp_group.return_value = mock_pcp_group
+
+            from vllm_ascend.worker.block_table import BlockTable
+
+            block_table = BlockTable(
+                block_size=self.block_size,
+                max_num_reqs=self.max_num_reqs,
+                max_num_blocks_per_req=self.max_num_blocks_per_req,
+                max_num_batched_tokens=self.max_num_batched_tokens,
+                pin_memory=self.pin_memory,
+                device=self.device,
+                kernel_sizes=self.kernel_sizes,
+                cp_kv_cache_interleave_size=cp_kv_cache_interleave_size,
+                num_speculative_tokens=0)
+
+            return block_table
+
+    def setup_block_table_data(self, block_table, num_reqs=2):
+        """Helper method to populate block table with test data"""
+        # Add block IDs for each request
+        for i in range(num_reqs):
+            block_ids = list(range(i * 4,
+                                   (i + 1) * 4))  # [0,1,2,3], [4,5,6,7], etc.
+            block_table.add_row(block_ids, i)
+
+    def _test_slot_mapping_for_ranks(self, dcp_world_size, pcp_world_size,
+                                     cp_kv_cache_interleave_size,
+                                     test_configs):
+        """Helper method to test slot_mapping across multiple ranks
+        
+        Args:
+            dcp_world_size: Number of DCP ranks
+            pcp_world_size: Number of PCP ranks
+            cp_kv_cache_interleave_size: Interleave size for KV cache
+            test_configs: List of tuples (dcp_rank, pcp_rank, req_indices, positions, expected_result)
+        """
+        for dcp_rank, pcp_rank, req_indices, positions, expected_result in test_configs:
+            with self.subTest(dcp_rank=dcp_rank, pcp_rank=pcp_rank):
+                block_table = self.create_block_table(
+                    dcp_world_size, dcp_rank, pcp_world_size, pcp_rank,
+                    cp_kv_cache_interleave_size)
+
+                num_reqs = max(req_indices) + 1 if len(req_indices) > 0 else 1
+                self.setup_block_table_data(block_table, num_reqs=num_reqs)
+
+                block_table.compute_slot_mapping(req_indices, positions)
+
+                actual_result = block_table.slot_mapping.np[:len(positions)]
+                np.testing.assert_array_equal(
+                    actual_result, expected_result,
+                    f"DCP={dcp_world_size}, PCP={pcp_world_size}, "
+                    f"interleave={cp_kv_cache_interleave_size}, "
+                    f"dcp_rank={dcp_rank}, pcp_rank={pcp_rank}")
+
+    def test_compute_slot_mapping_dcp1_pcp1_interleave1(self):
+        """Test compute_slot_mapping with DCP=1, PCP=1, interleave_size=1
+        
+        With no parallelism (DCP=1, PCP=1), all tokens are local to the single rank.
+        
+        Setup:
+        - Block size: 16
+        - Request 0 has blocks: [0, 1, 2, 3]
+        - Request 1 has blocks: [4, 5, 6, 7]
+        
+        Test positions for each request:
+        - Request 0, position 0: block_id=0, offset=0 → slot = 0*128+0 = 0
+        - Request 0, position 1: block_id=0, offset=1 → slot = 0*128+1 = 1
+        - Request 1, position 0: block_id=4, offset=0 → slot = 4*128+0 = 512
+        - Request 1, position 1: block_id=4, offset=1 → slot = 4*128+1 = 513
+        """
+        req_indices = np.array([0, 0, 1, 1], dtype=np.int32)
+        positions = np.array([0, 1, 0, 1], dtype=np.int32)
+
+        expected_result = np.array([0, 1, 512, 513], dtype=np.int32)
+
+        test_configs = [
+            (0, 0, req_indices, positions, expected_result),
+        ]
+
+        self._test_slot_mapping_for_ranks(dcp_world_size=1,
+                                          pcp_world_size=1,
+                                          cp_kv_cache_interleave_size=1,
+                                          test_configs=test_configs)
+
+    def test_compute_slot_mapping_dcp4_pcp2_interleave1(self):
+        """Test compute_slot_mapping with DCP=4, PCP=2, interleave_size=1
+        
+        With interleave_size=1, tokens are distributed round-robin across all 8 ranks:
+        - Position 0 → Rank 0
+        - Position 1 → Rank 1
+        - Position 2 → Rank 2
+        - ...
+        - Position 7 → Rank 7
+        - Position 8 → Rank 0 (wraps around)
+        """
+        req_indices = np.array([0] * 16, dtype=np.int32)
+        positions = np.array(list(range(16)), dtype=np.int32)
+
+        # Manually computed expected values for each rank
+        # Rank assignment: current_rank = 4 * pcp_rank + dcp_rank
+        test_configs = []
+
+        # For each rank, specify which positions it owns and their local slot mapping
+        rank_expectations = {
+            # Rank 0 (pcp=0, dcp=0): positions 0, 8
+            0: [0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1],
+            # Rank 1 (pcp=0, dcp=1): positions 1, 9
+            1: [-1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1],
+            # Rank 2 (pcp=0, dcp=2): positions 2, 10
+            2: [-1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1],
+            # Rank 3 (pcp=0, dcp=3): positions 3, 11
+            3: [-1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1],
+            # Rank 4 (pcp=1, dcp=0): positions 4, 12
+            4: [-1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1],
+            # Rank 5 (pcp=1, dcp=1): positions 5, 13
+            5: [-1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1],
+            # Rank 6 (pcp=1, dcp=2): positions 6, 14
+            6: [-1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1, -1],
+            # Rank 7 (pcp=1, dcp=3): positions 7, 15
+            7: [-1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 1],
+        }
+
+        for pcp_rank in range(2):
+            for dcp_rank in range(4):
+                current_rank = 4 * pcp_rank + dcp_rank
+                expected_result = np.array(rank_expectations[current_rank],
+                                           dtype=np.int32)
+                test_configs.append((dcp_rank, pcp_rank, req_indices,
+                                     positions, expected_result))
+
+        self._test_slot_mapping_for_ranks(dcp_world_size=4,
+                                          pcp_world_size=2,
+                                          cp_kv_cache_interleave_size=1,
+                                          test_configs=test_configs)
+
+    def test_compute_slot_mapping_dcp4_pcp2_interleave128(self):
+        """Test compute_slot_mapping with DCP=4, PCP=2, interleave_size=128
+        
+        With interleave_size=128, tokens are distributed in chunks of 128 across ranks.
+        Virtual block size = 16 * 4 * 2 = 128
+        
+        Token distribution with interleave_size=128:
+        - Positions 0-127 belong to rank 0 (first chunk of 128)
+        - Positions 128-255 belong to rank 1 (second chunk of 128)
+        - Positions 256-383 belong to rank 2 (third chunk of 128)
+        - And so on...
+        
+        Using 130 positions ensures we test both rank 0 (positions 0-127) and rank 1 (positions 128-129).
+        """
+        num_positions = 130
+        req_indices = np.array([0] * num_positions, dtype=np.int32)
+        positions = np.array(list(range(num_positions)), dtype=np.int32)
+
+        # With interleave_size=128 and virtual_block_size=128:
+        # Positions 0-127 belong to rank 0
+        # Positions 128-129 belong to rank 1
+        test_configs = []
+
+        # Build expected results for each rank
+        for pcp_rank in range(2):
+            for dcp_rank in range(4):
+                current_rank = 4 * pcp_rank + dcp_rank
+                expected_result = []
+
+                if current_rank == 0:
+                    # Rank 0 gets positions 0-127
+                    # Each maps to its local slot: 0, 1, 2, ..., 127
+                    for pos in range(130):
+                        if pos < 128:
+                            expected_result.append(pos)
+                        else:
+                            expected_result.append(-1)
+                elif current_rank == 1:
+                    # Rank 1 gets positions 128-129
+                    # Position 128 maps to local slot 0, position 129 to local slot 1
+                    for pos in range(130):
+                        if pos == 128:
+                            expected_result.append(0)
+                        elif pos == 129:
+                            expected_result.append(1)
+                        else:
+                            expected_result.append(-1)
+                else:
+                    # All other ranks get no positions
+                    expected_result = [-1] * 130
+
+                test_configs.append(
+                    (dcp_rank, pcp_rank, req_indices, positions,
+                     np.array(expected_result, dtype=np.int32)))
+
+        self._test_slot_mapping_for_ranks(dcp_world_size=4,
+                                          pcp_world_size=2,
+                                          cp_kv_cache_interleave_size=128,
+                                          test_configs=test_configs)
+
+
+if __name__ == '__main__':
+    unittest.main()