Aiming at the fluency problem of extractive method. the accuracy problem of abstractive method. and the important information missing problem caused by truncating the original document before document encoding. this paper proposes a two-stage long document summarization model SFExt-PGAbs. https://www.roneverhart.com/100-Percent-Sunglasses-SPEEDCRAFT-LE-Money-Mike-HiPER-Silver-Mirror/