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In this paper, we design and implement 3D scan conversion algorithm using Handel-C language. Primarily we introduce the 3D graphics rendering process and analyze the principle of improved scan conversion algorithm. Then we design and implement the improved scan conversion algorithm. Finally we translate the Handel-C code into Verilog-HDL code and verify the design in ModelSim. Parallel optimization schemes are introduced in Handel-C porting. The performance increases more than 12 times after optimization. The design experience shows that the hardware implementation of complex algorithm based on Handel-C is feasible and efficient.