1. Direct removal: Pull the needle out of the grave or cut it off with scissors.

2. Pruning: Use professional gardening tools to trim the needles neatly to make the tomb look neat.

3. Cover: Cover the grave with covering, such as stones and turf, so that the needles can't grow.

4. Prevention: Kill or drive away the needles by using herbicides or poisons.

Please note that when handling needles, we should respect the graves and the dead, and observe local customs and habits. If you are not sure about the needle on the grave or have other problems, please consult the relevant local departments or professionals.