中文摘要：

使用云南天文台丽江观测站2．4m望远镜云南暗弱天体光谱及成像仪（Yunnan Faint-Object Spectrograph and Camera，YFOSC）终端观测时，有时会产生明显的干涉条纹。采用空域栈中值滤波方法对I滤光片的观测图像进行干涉条纹的提取和剔除。进一步采用生长曲线的方法对比剔除干涉条纹前后的测光发现，剔除干涉条纹后暗星的测光精度有明显的改善。

英文摘要：

Interference fringes are obviously present in some CCD images obtained by on the 2.4m telescope at the Lijiang station of the Yunnan Observatory. This is especially taken with long-wavelength bandpasses, such as the Johnson I bandpass. As an experiment to fringes we created a ＂supersky＂ image by stacking a series of CCD images of the open cluster by the telescope in the I bandpass. After subtracted by the ＂supersky,＂ which contains the YFOSC camera the case for images remove interference NGC 2324 observed the pattern of the interference fringes, the observed CCD images of the cluster become greatly improved in quality, and the photometric precisions of faint stars in the images are about twice better than without the ＂supersky＂ subtraction.