Oscillatory problems of a class of third order nonlinear delay differential equations were studied. With the techniques of operator and integral, the determinant conditions in which such equations had not A-type solution （or B-type solution） were given. Further, several new sufficient conditions for oscillation of such equations were obtained via suitable comparison the- orems. Obtained results generalize and improve some known results of the latest literature and fully reflect the influence action of delay in equation oscil...
