---
title: "什么是 SaaS (Software as a Service)？"
canonical: https://wavect.io/zh/glossary/saas/
language: zh
description: "你租用而非拥有的软件：供应商托管它、运行它并收取订阅费，而客户只需通过浏览器登录。"
image: "https://wavect.io/img/general/bak/open_graph_preview.jpg"
---

技术

# SaaS

Software as a Service

你租用而非拥有的软件：供应商托管它、运行它并收取订阅费，而客户只需通过浏览器登录。

最近审阅: 2026-06-02 审阅人 [Kevin Riedl](/zh/team/kevin-riedl/) [wiki ↗](https://www.wikidata.org/wiki/Q139796365)

SaaS 是一种交付和商业模式，而不是一种技术。供应商不是把软件的一份副本卖给你让你自己安装和运行，而是托管它、运营它，并按周期性费用通过 Web 给你访问权限。你登录、你使用、你从不碰服务器。Salesforce、Slack 和 Notion 都是 SaaS。客户租用能力，而不是购买和维护软件。

其决定性的技术特征是多租户（multi-tenancy）：一个运行中的系统同时服务许多客户，他们的数据彼此隔离。这一个选择塑造了一切。你为租户之间的隔离和安全而设计，为一次性向所有人部署更新而不破坏任何人而设计，并为随客户增加而扩展而设计，而不是一年发布一次新版本。这种扩展是落在一个单体里、还是落在 [微服务](/zh/glossary/microservices/) 里，是另一个独立的决策，它应当跟随负载，而不是跟随潮流。它也改变了运维，因为现在是供应商承担正常运行时间、备份和安全这一持续的责任，而不是客户。

商业模式是另一半。收入是一种订阅，通常按月或按年，这意味着关系不在销售时结束，而是在那里开始。重要的指标变成了经常性收入、流失率（churn）以及服务每个客户的成本。定价通常与价值或用量挂钩：按席位、按层级或按用量。如果定价模式搞错了，一个技术上卓越的产品仍会在每个客户身上亏钱，所以定价既是销售决策，也同样是架构决策。

我们端到端地构建 SaaS 产品，从多租户 [架构](/zh/services/software-development/) 到客户登录进去的 [Web 应用](/zh/services/web-apps/) ，通常从一个 [MVP](/zh/glossary/mvp/) 起步，并在产品找到 [PMF](/zh/glossary/pmf/) 之后再加固它。Polity 就是一个 SaaS 产品。创始人低估的诚实之处：周期性模式意味着你正在签约承担对正常运行时间、安全和支持的永久责任，这是一项真实的运营成本，而不是一次性的构建。

// FAQ

## 常见问题

### 什么是 SaaS？

软件即服务：由供应商托管和运行、以订阅方式出售、通过 Web 访问的软件。客户租用能力并通过浏览器登录，而不是自己安装和维护软件。Salesforce、Slack 和 Notion 是典型例子。

### 什么是多租户？

一个运行中的系统同时服务许多客户，每个客户的数据彼此隔离。它是 SaaS 的决定性技术特征，并塑造了整个架构：隔离、租户之间的安全，以及一次性向所有人部署更新而不破坏任何人。

### SaaS 模式对定价意味着什么？

收入是经常性的，通常按席位、层级或用量计，所以关系在销售时开始而不是结束。流失率和服务每个客户的成本变成了重要的数字。如果定价模式搞错了，即使是一个出色的产品也会在每个客户身上亏钱，所以定价也是一项架构决策。

相关术语

- [MVP](/zh/glossary/mvp/)
- [PMF](/zh/glossary/pmf/)
- [Microservices](/zh/glossary/microservices/)

相关服务

- [定制软件开发](/zh/services/software-development/)
- [Web 应用](/zh/services/web-apps/)

相关案例研究

- [Polity](/zh/case-studies/polity/)

相关指南

- [如何为 MVP 选择技术栈](/zh/software-development-guide/how-to-choose-a-tech-stack-for-mvp/)

聊聊

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