1.Check cloud pixel value in Band BQA Landsat8 ,Cloud pixel value ≥ 2800 in Band BQA.
2.Create cloud pixel value ≥ 2800 is equal to 0 and Other values is equal to 1
formula Con(( Band BQA ) ≥ 2800, 0 , 1) Output Cloud
(calculat by raster calculator in Arcgis)
3.Create remove cloud by raster calculator in Arcgis
Float(landsatBand2 * Cloud ) Output landsatBand2 none Cloud