Volume fracturing is one of the key technologies for the efficient development of unconventional oil and gas resources. At present，volume fracturing has entered the stage with the core characteristics of multi-cluster，small cluster spacing，limited entry perforating，temporary plugging diversion，high injection rates and high-intensity proppant injection. Perforation erosion is serious in cases of high injection pressure，high injection rates and high sand concentrations. This leads to high likelihood of failure of temporary plugging and limited entry and consequently high difficulties in delivering spontaneous initiation and uniform propagation of fractures due to competitive fluid attraction among perforation clusters within one fracturing stage，which is practically restraining the safe and high-efficiency development of unconventional oil and gas. A global literature review of the studies on perforation erosion in both China and other countries is performed. The theoretical models of perforation erosion are summarized，and the research status of perforation erosion is analyzed. The causes of perforation erosion during large-scale propped fracturing are discussed，the factors affecting perforation erosion are identified，and the countermeasure strategies are proposed. Clarifying the main factors controlling perforation erosion and the corresponding laws and developing protective measures are of great engineering significance for the efficient development of unconventional hydrocarbon resources.

Proppant transport is a critical process that determines the conductivity of hydraulic fractures and thus，is of great significance for the efficient development of unconventional oil and gas reservoirs. This paper systematically reviews the progress in research on proppant transport，summarizes the advantages and limitations of three types of research methods，namely theoretical models，physical experiments，and numerical simulations，and reveals the multi-factor coupling effects of proppant characteristics，fracture morphology，operational parameters and reservoir environment are revealed. It is indicated that micronized proppants can enhance the filling rate of secondary fractures，but need to be combined with composite proppant injection processes to compensate for insufficient near-end support. In complex fractures，proppant distribution is considerably influenced by the flow splitting and rough fracture surface，requiring optimization through temporary plugging diversion and high-viscosity fracturing fluids. The integration of numerical simulations and machine learning techniques has significantly improved the prediction accuracy of complex fracture networks. Future research shall more focus on dynamic characterization of multi-scale fracture networks，long-term conductivity evaluation under high temperature and pressure，and the industrial application of intelligent fracturing technologies to facilitate controllable proppant placement and long-term conductivity and provide theoretical support for the efficient development of unconventional oil and gas resources.