In order to accelerate the development and application of the domestic dual phase steel, the effect of the heating speed, intercritical annealing temperature, overaging temperature, and the time of overaging on the micro structure and properties of DP590 dual phase steels were studied by a CAS-300 II annealing simulator. The results showed that the yield strength and tensile strength both increate and elongation and product of strength and ductility both decreased with the increate of the heating speeds between 5 and 60˚C/s. the yield strength and tensile strength both decreased first, then increased, the elongation and product of strength and ductility both increased with the increase of intercritical annealing temperatures between 780 and 850˚C, the yield strength increase, tensile strength decrease, the elongation increased generally, the yield ratio increase apparently with the increase of the overaging temperature between 260 and 400˚C.when the overaging temperature was 280˚C, the yield strength and tensile strength both decrease, the elongation and product of strength and ductility decreased first, then increased with the increase of the over aging time within the range of 240-480s.