9,10-dihydro-9-oxa-10-phosphenanthrene -10-oxide (DOPO) and its derivatives are generally use as a flame retardant in semiconductor and textile industries. There are more friendly environment competed with conventioned halogenated flame retardants, their performance are better then phosphorus flame retardants. At moment we haven’t found a suitable rubber halogen-free flame retardants. Hence we synthesized a series of DOPO type reactive flame retardants, such as allyl DOPO, and evaluated and discussed their performance.The results showed that allyl DOPO flame retardants in CR has an excellent fire-retardant effect, and it can reach V0 flame retardant fire rating with a small amount of graphite.