Chen Rentao(1906-1968)was one major collector of Chinese antiquities, particularly coins and paintings in 20th Century. He was a legend who was active in the collecting field of Shanghai and Hongkong in the middle of he last century,He was fond of collecting with a wide range of collections in his life. He was well versed in inscriptions on ancient bronzes and stone tables, and also made extraordinary achivements in the fields of cultural relics, calligraphy and paintings, coins, and so on. In''KIN KWEI LUN KU TSUNG HO K´AN''(in Chinese 金匮论古合集)， Chen have just self-reported like that: '' I am addicated to antiques, and i have been working hard for more than 20 years.No matter metal,stone,porcelain or jade, ancient coins,calligraphy and painting, everything i have seen and heard is believed to be the most refined and rarer. As long as it´s worth the price,no matter how high the price is and no matter how many places need to be visit, i must get it sa soon as possible.As time accumulates, there are more and more collections''.

《易筋经》为中医导引、气功保健之古典名著，署为南北朝时天竺达摩祖师（Bodhidharma）所著，然观其书中理论体系与行功心法皆属道家，据后人考为明天启四年（1624年）天台紫凝道人托名而作。早期抄本流传甚少，且互有差异并不规范，至清中始有来章氏付梓印行，后又几经翻刻，讹误渐多，以致今日通行诸本已鲁鱼混杂，教后人修习者诘聱生歧，不得本意也。  乐卷楼藏有来章氏原版一部，其文字版刻清晰方正，易于识读；版画精美，尚存明人气息，为目前所知最初印本。更难得者，行功图例旁并有前辈宗师之墨笔批注，阐其要法、明其精义，更易后人研读修习，其中若干文字内容，可修订今世通行版本之谬误，不致有一字之谬而误终身之憾。故未敢秘藏，而将全书依原大影印出版。冀有益于学人参习清源正本，并助珍贵古籍流传广布。然藏者孤陋浅学，不谙此术，原书中或有内容深奥、偏差讹误之处，实难考证校勘，还祈读者恕罪，并明目自验，辩证习之为盼。