A new type of isosceles blazed grating with compensated phase on the obverse side (IBGCPOS) is designed. Isosceles design ensures the positive and negative diffractive orders distributing on the two sides of the grating normal symmetrically. By optimizing the size of the groove to observe phase compensation, the diffractive energy can be transferred to the middle orders. Two maximum diffractive directions are reserved. Energy distribution of zeroth order and higher orders diffraction is restrained, which can avoid energy wasting. Moreover,the problems of double-sided fabricating alignment and multiple-diffraction are solved. The theoretical model of diffraction intensity is founded and simulated by computer. The difference between IBGCPOS and the isosceles blazed grating with compensated phase on the inverse side (IBGCPIS) is analyzed. Typical distribution figures of diffraction intensity are given. In addition, the fabricating method with gray-scale mask for the new type grating is discussed.