四川长江QYE12-1起重机具有以下优点：1. 高起重能力：该起重机的额定起重能力为12吨，能够满足大部分中小型工程项目的起重需求。2. 较小的机身尺寸：起重机的整体尺寸相对较小，便于在狭窄的施工场地中操作，同时也能降低运输成本。3. 灵活性强：起重机采用履带底盘设计，具有良好的转弯半径，能够在狭小的工地中自由转动，提高施工效率。4. 操作简便：起重机采用液压控制系统，操作简单方便，能够快速调整起重角度和高度，提高施工效率。5. 安全可靠：起重机配备有多重安全保护装置，如重载预警系统、超载保护系统和限位装置等，能够有效保障施工人员和设备安全。6. 维护成本低：起重机的维护成本相对较低，具有较长的使用寿命，为用户节省了维修和更换成本。综上所述，四川长江QYE12-1起重机具有高起重能力、小尺寸、灵活性强、操作简便、安全可靠和维护成本低等优点，非常适合中小型工程项目的起重作业。

Sichuan Changjiang QYE12-1 crane has the following advantages: 1. high lifting capacity: the rated lifting capacity of the crane is 12 tons, which can meet the lifting needs of most small and medium-sized projects. 2. small body size: the overall size of the crane is relatively small, which makes it easy to operate in narrow construction sites and also reduces the cost of transportation. 3. flexible: the crane adopts a crawler chassis design, with a good turning radius, can be freely turned in the narrow construction site to improve construction efficiency.4. Easy operation: the crane adopts a hydraulic control system, simple and convenient operation, can quickly adjust the lifting angle and height to improve construction efficiency.5. Safe and reliable: the crane is equipped with multiple safety protection devices, such as heavy load warning system, overload protection system and limit devices, can effectively protect the construction personnel and equipment safety.6. 6. low maintenance cost: the crane has relatively low maintenance cost and long service life, which saves maintenance and replacement cost for users. To summarize, Sichuan Changjiang QYE12-1 crane has the advantages of high lifting capacity, small size, flexibility, easy operation, safety, reliability and low maintenance cost, which is very suitable for lifting operations in small and medium-sized projects.