The transient photovoltaic properties in the nanosecond region as the function of intensities and wavelengthes of incident light, as well as the spectral dependence of the CW photovoltaic response in Al/a SnPc/ITO sandwich cell have been reported. The CW photovoltaic action spectrum is similar to the absorption spectrum. The magnitude, polarity and response time of the transient photovoltage are found to be dependent on the intensity and wavelength of the incident light. The mechanism for this transient photovoltaic effects is briefly discussed.