PURPOSE: The titled flame-retardant composition having improved heat distortion properties and hydrolysis resistance free from bleeding of frame-retardant, obtained by blending a thermoplastic polyester with brominated polycarbonate, brominated epoxy resin, inorganic flame-retardant auxiliary, etc.

CONSTITUTION: 100pts.wt. thermoplastic polyester consisting of terephthalic acid or its ester and 2W4C glycol as main components is blended with 3W 50pts.wt. flame-retardant consisting of a low-molecular-weight brominated polycarbonate shown by the formula I (m is 1W4; n is 2W15; R1 is 1W5C lower alkyl), having end groups hindered with alkylphenols and 2W15 polymerization degree, and a brominated epoxy resin shown by the formula II (Z is H, or methyl; l<10), having ≤10 polymerization degree, in a molar ratio of (90W50)/ (10W50), and 0.1W20pts.wt. inorganic flame-retardant auxiliary (e.g., especially antimony trioxide, etc.). The addition of 0W150pts.wt. reforcing filler (e.g., glass fiber, etc.) improves further mechanical strength and heat resistance.