Radiation_Induced Soft Error Rate (Ser) Degrades the Reliability of Static Random Access Memory(Sram)-Based Field Programmable Gate Arrays (Fpgas).This Paper Presents a New Built-In 2-D Hamming Product Code (2-D Hpc)Scheme to Provide Reliable Operation of Sram-Based Fpgas In Hostile Operating Environments Such As Space.Multibit Error Correction Capabilit Such As Space.Multibit Error Correction Capability of Our Built-In 2-D Hpc Can Improve the Reliability ,And Hence ,System Availability ,By Orders of Magnitude.Simulation Results Show That the Large Number of Error Correction Capability of 2-D Hpc Can Recover Configuration Bits Without Depending on an External Memory Preserving a Golden Copy of the Configuration Bits. to Provide Efficient 2-D Hpc In a Built-In Logic ,We Also Propose a New 2-D Sram Buffer.Using the Proposed Multibit Error Correction Scheme,System Availability of an Sram-Based Fpga Can Be More Than 99.9999999% With Sram Cell Faiure In 1 Billion H of Operation of 7.