This paper deals with the extractives of high-yield Neosinocalamus sulfonated chemimechanical pulp（SCMP） and their effects on the hydrogen peroxide bleaching.The results show that the extractives from Neosinocalamus SCMP in benzene-alcohol,dichloromethane and methanol are all in low content,that the extractives mainly contain fatty acids and steroids,as well as some substances producing UV absorption at about 330nm,that the brightness of peroxide-bleached pulp after the extraction increases by more than 6%,and by 9%ISO especially after the benzene-alcohol extraction,and that the yellowish phenomenon of the bleached pulp lightens to a degree of 37.3% at most and the heat-induced yellowing value decreases by 65.8% at most.