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A dual anode electron gun has been designed using EGUN and TRAK codes for Ku-band 140 W short length space Traveling Wave Tube (TWT). Pierce type electron gun with an electrically isolated beam forming electrode (BFE), a control anode and an ion barrier anode (A0) in addition to ground has been opted. Due considerations have been given in the design of gun assembly to ensure the long life (>10 years) and high reliability. A PPM circuit with confined beam flow focusing has also been designed with Sm2Co17 magnets using in-house developed code MAGFLD. A good beam laminarity and beam ripples (<;5%) have been obtained. An electron gun assembly has been designed and developed with due considerations for high voltage and thermal considerations from space TWT point of view.