A laser phase determination method and a transfer equation which makes use of the proportional term of the measured photoelectron energy spectrum are presented to directly measure the detailed temporal structure of a narrow bandwidth attosecond XUV pulse. The method is based on the spectrum measurement of electrons generated by XUV photo-ionization interacting with a femtosecond laser field. The results of the study suggest that the measurement should be taken at 0° or 180° with respect to the linear laser polarization. The method has a temporal measurement range of about half a laser oscillation period. The temporal resolution also depends on the jitter and control precision of the laser and XUV pulses.