We have developed the Progressive Parallel Plasma (P³) 2D code tuned for the massively parallel scalar computer ‘Intel Paragon XP/S 75MP834’. The computer is composed of 834 nodes and each node has 1 communication and 2 calculation CPUs and 128Mbyte random access memory (RAM). The computer has a total performance of 100GByte RAM and 120GFLOPS. The scheme for parallelization is domain decomposition and information of the particles crossing the node’s boundary is communicated to 2 neighbor nodes. The performance of the calculation for plasma particle simulations is 53 nano seconds/simulation time step/particle, which corresponds to effectively 42GFLOPS. By using the P³ 2D code, a simulation including 1 Giga particles can be completed within a few days.