摘要： 現代消費者常以視覺吸引購買產品，因此外觀極為重要，很多採收前因素均影響產品外觀，果實易遭受昆蟲、鳥害、日傷及污損，因此物理方法之保護為防止此類損傷所必要且能加強產品外觀。本試驗試以物理方法，套袋及方盒處理，研究其對熱帶果樹如紅龍果（Hylocereus undatus）、黃晶果（Pouteria caimito）、星蘋果（Chrysophyllum caimito）及番石榴（Psidium guajava）等果實形態之影響。試驗採用三種不同紙袋(白色、褐色及透明塑膠袋)及塑膠方盒，並記錄不同處理及對照組之光強度、溫度及相對濕度，試驗顯示塑膠方盒能使果實成為方形，果實品質項目如果重，果長、果徑、可溶性固形物含量、硬度及果色均加以評估，各種套袋及方盒處理對熱帶果樹果實品質之影響於本文中分別討論。Consumers nowadays buy what appeals to their eyes hence the appearance of the final product is of paramount importance. A wide range of preharvest factors are known to affect the appearance of the harvested product. Fruits are susceptible to insect attack, bird damage, sunburn, and blemish. Physical protection is important to reduce these damages and to enhance the final appearance of the fruit. This experiment attempts to evaluate how much physical methods (bagging and plastic boxes) can influence morphological changes in tropical fruits such as: Pitaya Hylocereus undatus, Abiu Pouteria caimito, Star apple Chrysophyllum caimito and Guava Psidium guajava. Three different types of bags (white, yellow/black-inner coated paper and plastic transparent polyethylene bag) and separately plastic boxes were used. Light intensity, temperature and relative humidity inside the bags and boxes as well as environmental conditions were recorded. It was proven that the use of plastic boxes can affect the shape of the fruit. Fruit quality characteristics such as fruit weight, length, diameter, soluble solids, firmness and colour were evaluated. In some instances bagging and boxing had positive and negatives effect among tropical fruits.